Undated handout image courtesy of the U.S. Air Force shows a MQ-1 Predator unmanned aircraft. The United States has agreed in principle to deploy U.S. Predator drones on Turkish soil to aid in the fight against Kurdish separatist rebels, Prime Minister Tayyip Erdogan said. The U.S. military flies unarmed surveillance Predators based in Iraq and shares images and vital intelligence with Turkey to aid Ankara as it battles Kurdish Kurdistan Workers' Party (PKK) rebels who have camps in northern Iraq. REUTERS/U.S. Air Force/Lt Col Leslie Pratt/Handout (UNITED STATES - Tags: CONFLICT POLITICS MILITARY) FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS. THIS IMAGE HAS BEEN SUPPLIED BY A THIRD PARTY. IT IS DISTRIBUTED, EXACTLY AS RECEIVED BY REUTERS, AS A SERVICE TO CLIENTS